engine Supercharged AMG V8 position Front Longitudinal aspiration Supercharged & Intercooled valvetrain SOHC w/3 Valves per Cyl displacement 5439 cc / 331.9 cu in bore 97 mm / 3.82 in stroke 92 mm / 3.62 in power 462.3 kw / 620 bhp hp per litre 113.99 bhp per litre torque 890 nm / 656.4 ft lbs drive wheels RWD body / frame Unit Steel front brakes AMG Composite Discs w/ABS, ESP rear brakes AMG Ventilated Discs w/ABS, ESP front wheels F 50.8 x 24.1 cm / 20 x 9.5 in rear wheels R 50.8 x 26.7 cm / 20 x 10.5 in front tire size 255/40-18 rear tire size 285/35-18 steering AMG Rack & Pinion w/Power Assist f suspension Semi-active air suspension with torsion bar stabilizer r suspension Semi-active air suspension with torsion bar stabilizer transmission 7G-TRONIC